Method and composition for treating friction fabric



Patented Apr. 14, 1936 METHOD AND COMPOSITION FOR TREAT ING FRICTIONFABRIC Julius W. Abernethy,

Alfred B. Kuhn,

Sidney J. Smyer, and

Newton, N. C.

7 No Drawing. Application August '3, 1933,

Serial No. 683,

14 Claims.

This invention relates to a composition for treating asbestos frictiontape or fabric and also to the method of treating friction fabric so asto greatly increase the efficiency of the friction fabric, to impartthereto longer life, and more desirable qualities in general.

It is an object of this invention to provide a method as well as acompositionfor treating asbestos friction tape or fabric so as to impartto it qualities which will remain the same throughout the entire life ofthe friction fabric under all kinds of climatic conditions and all typeand conditions of humidity so that the friction fabric will have aconstant braking effect regardless of the length of time the frictionfabric has been used.

It is another object of this invention to provide a composition fortreating friction fabric and the method of so treating the frictionfabric to provide a fabric which will not deteriorate or lose any of itsqualities when kept in storage for an indefinite period before beingplaced in service.

It is another object of this invention to provide a method of treatingfriction fabric and ingredients for carrying out the method so as toprovide a friction fabric which will impart a constant friction andwhich will not grab or slip in applying friction, which will last muchlonger than other types of friction fabric and which will not scar orwear the braking surfaces against which the friction fabric is applied.

The composition for the treatment of the friction fabric comprisesapproximately the following ingredients by weight: /2% castor oil, 2%pine rosin, 16% gilsonite selects; l /2% dry red lead. carbon black, 5%Chinawood oil, 2 linseed oil, and about 72% of a suitable mineralthinner. Gilsonite selects is the commercial name of a hard, almost puregrade of natural bitumen and is mined in Utah. The approximate analysisof this material is as follows: Specific gravity at 60 degrees F. 1.04.Melting point (over mercury) 280 to 310 degrees F.

Percent Soluble in carbon bisulphide 99.98 Mineral matter (ash) .02Fixed carbon 12.0

Character of fracture-bright-semi-conchoidal The above ingredients withthe exception of the mineral thinner, are thoroughly mixed and placed ina suitable jacket kettle and heated to about 450 degrees F.- and themixture is held at 5 this temperature for about two hours. Then themixture is cooled to about 350 degrees F. and the mineral thinner isadded thereto and thoroughly mixed with the other ingredients in thesolution.

After the mixture has been prepared as above outlined, it is lowered-toa proximately 200 degrees F. and the friction fabric is immersed in thesolution and let remain in the same for a period of about thirtyminutes, the temperature being at about 200 degrees F., during thisentire period. The friction fabric is 10 then removed and placed on adrying rack at room temperature and let remain on the drying rack forabout 24 hours. The friction fabric is then placed in an oven and bakedfor about one hour at a temperature of about 375 degrees F. The 15treated fabric isthen'removed from the oven through a set of calenderrolls of the correct size while the tape or fabric is still hot. Thetape or fabric is then placed in a-dry room and let remain in thiscondition for a period of about 20 sixty days to thoroughly cure andage. The treated fabric isthen put through another solution ofapproximately 50% each, by weight, of castor oil and the mineral thinnerand left in this second solution for about ten through squeeze rolls toremove from the fabric any of the surplus mixture to which it has beensubjected. The tape .or fabric is then calendered down to' correct sizesas to width and thicknes's.

i We claim: V

l. A composition for treating friction fabric comprising a mixture ofcastor oil, pine rosin, gilsonite selects, dry red lead, carbon black,Chinawood oil, linseed oil and a mineral thinner. 35

2. A composition for treating friction fabric comprising a mixture ofcastor oil, rosin, gilsonite selects, litharge, coloring pigments,Chinawood oil and a thinner,

3. A composition for treating friction fabric 40 comprising a mixture ofvegetable oil, pine rosin, an asphaltic composition, coloring matter,Chinawood oil and a thinner.

4. That method of treating friction fabric which comprises subjectingthe fabric to a bath 45 having therein /z% castor oil, 2% pine rosin,16% gilsonite selects, 1 red lead, /z% carbon black, 5% Chinawood oil, 25% linseed oil and 72% mineral thinner for about thirty minutes at atemperature of about 200 degrees F., 50 then drying the fabric, thenbaking the fabric for approximately thirty minutes at a temperature ofapproximately 375 degrees F., then calendaring the fabric while hot,then drying and aging, then treating the fabric to a bath of 50%mintemperature of ap- 5v minutes and then removed 25.

eral thinner and 50% castor oil for about ten minutes, then squeezingthe solution from the fabric and then calendaring to bring to propersize.

5. That method of treating friction fabric which comprises subjectingthe fabric to a bath heated to approximately 200 degrees F. andcomprising /2% castor oil, 2% pine rosin, 16% gilsonite selects, 1 redlead, /2% carbon black, 5% Chinawood oil, 2 linseed oil and. 72% mineralthinner, then drying the fabric, then subjecting the fabric to anotherbath comprising 50% mineral thinner and 50% castor oil, then extractingthe solution from the fabric and then calendaring the fabric intodesired shape.

6. That method of treating friction fabric which comprises preparing amixture of castor oil, pine rosin, gilsonite selects, red lead, carbonblack, Chinawood oil, linseed oil and heating the mixture to about 450degrees F. for about two hours, then allowing the mixture to cool toabout 350 degrees F. and adding thereto a mineral thinner, then reducingthe temperature of the mixture to about 200 degrees F. and placing thefriction fabric therein for about thirty minutes, then removing thefabric from the mixture and drying the same, then baking the fabric forapproximately thirty minutes at a temperature of about 375 degrees F.,then calendaring the fabric, then curing the fabric, then subjecting thefabric to a solution of mineral thinner and castor oil, and then formingthe fabric into proper shape.

'7. That method of treating friction fabric which comprises subjectingthe fabric to a heated bath having therein castor oil, rosin, gilsoniteselects, red lead, Chinawood oil, linseed oil and a mineral thinner,then removing the fabric from the bath and drying the same, then bakingthe fabric, then calendaring the fabric while hot, then aging thefabric, then treating the fabric to a bath of castor oil and mineralthinner then squeezing the solution from the fabric and calendaring thefabric to bring it to desired form.

8. That method of treating friction fabric which comprises subjectingthe fabric to a heated bath having therein castor oil, rosin, gilsoniteselects, red lead, Chinawood oil, linseed oil and a thinner, thenremoving the fabric from the bath and drying the same, then baking thefabric then calendaring the fabric while hot, then aging the fabric,then treating the fabric to a bath of vegetable oil and a thinner, thensqueezing the solution from the fabric and calendaring the fabric tobring it to desired form.

9. That method of treating friction fabric which comprises subjectingthe fabric to a heated bath having therein castor oil, rosin, gilsoniteselects, red lead, Chinawood oil, linseed oil and a thinner.

10. That method of treating friction fabric which comprises subjectingthe fabric to a heated bath having therein castor oil, rosin, gilsoniteselects, red lead, Chinawood oil, and a thinner.

11. That method of treating friction fabric which comprises subjectingthe fabric to a heated bath having therein castor oil, pine rosin,gilsonite selects, red lead, carbon black, Chinawood oil, linseed oiland a mineral thinner.

12. That method of treating friction fabric which comprises subjectingthe fabric to a heated bath having therein castor oil, pine rosin,gilsonite selects, red lead, coloring pigments, Chinawood oil, linseedoil and a thinner.

13. That method of treating friction fabric which comprises subjectingthe fabric to, a bath having therein castor oil, pine rosin, gilsoniteselects, red; lead,- carbon blaclg Chinawood oil, linseed oil andmineral thinner, for about thirty minutes at a temperature of about 200degrees F., then drying the fabric, then baking the fabric forapproximately one hour at a temperature of approximately 3'75 degreesF., then calendaring the fabric while hot, then drying and aging, thentreating the fabric to a bath of mineral thinner and castor oil forabout ten minutes, then squeezing the solution from the fabric and thencalendaring to bring to proper shape.

14. That method of treating friction fabric which comprises subjectingto a bath heated to approximately 200 degrees F. and comprising castoroil, pin rosin, gilsonite selects, red lead, carbon black, Chinawoodoil, linseed oil and mineral thinner, then drying the fabric, thensubjecting the fabric to another bath comprising mineral thinner andcastor oil, then extracting the solution from the fabric and thencalendaring the fabric into desired shape.

JULIUS W. ABERNETHY. SIDNEY J. SMYER. ALFRED B. KUHN.

